import { API_URL, API_TOKEN, API_USER } from '../constants';
import { ApiInput, ApiResponseOutput, ProcessedResult, QaSectionResult, DetailedQaReport } from '../types';

const MAX_RETRIES = 3;
const INITIAL_RETRY_DELAY_MS = 1000;
const RETRYABLE_STATUS_CODES = [429, 502, 503, 504]; // 429: Too Many Requests, 5xx: Server Errors

// Add jitter to delay to prevent thundering herd problem
const delay = (ms: number) => new Promise(res => setTimeout(res, ms + Math.random() * 500));

// Structured error for workflow failures
class WorkflowError extends Error {
	code: string;
	at: 'network' | 'api' | 'stream' | 'parse' | 'unknown';
	debug?: string;
	constructor(code: string, message: string, at: 'network' | 'api' | 'stream' | 'parse' | 'unknown' = 'unknown', debug?: string) {
		super(message);
		this.name = 'WorkflowError';
		this.code = code;
		this.at = at;
		this.debug = debug;
	}
}

/**
 * Removes <think>...</think> blocks from a string.
 */
const cleanResponseText = (text: string): string => {
  if (typeof text !== 'string') return '';
  return text.replace(/<think>[\s\S]*?<\/think>/g, '').trim();
};

/**
 * Parses a single section of the QA report (e.g., TITLE, H1).
 * This uses regular expressions to be robust against multiline content and format variations.
 * @param sectionText The text content of a single QA section.
 * @returns A structured object with the section's results.
 */
const parseSection = (sectionText: string): QaSectionResult => {
	console.log('Parsing section text:', sectionText.substring(0, 200));
	
	// ROBUST GRADE EXTRACTION - handles multiple formats
	let grade = 'N/A';
	let gradeMatch = null;
	
	// Try various grade patterns in order of specificity
	const gradePatterns = [
		/-\s*\*\*Grade:\*\*\s*(.*)/,                    // - **Grade:** 100/100
		/•\s*\*\*Grade:\*\*\s*(.*)/,                    // • **Grade:** 100/100
		/\*\s*\*\*Grade:\*\*\s*(.*)/,                 // * **Grade:** 100/100
		/-\s*\*\*Grade\*\*:\s*(.*)/,                    // - **Grade**: 100/100 (colon without space)
		/•\s*\*\*Grade\*\*:\s*(.*)/,                    // • **Grade**: 100/100 (colon without space)
		/\*\s*\*\*Grade\*\*:\s*(.*)/,                  // * **Grade**: 100/100
		/(?:•|-|\*)\s*\*\*Grade\*\*:?:\s*(.*)/,             // •/**/- **Grade**: 100/100 or - **Grade** 100/100
		/(?:•|-|\*)\s*Grade:?:\s*(.*)/,                     // • Grade: 100/100 or - Grade 100/100
		/Grade:?:\s*(\d+\/\d+|\d+)/m,                    // Grade: 100/100 (anywhere in text)
		/(\d+\/\d+)\s*(?:grade|Grade)/                  // 100/100 grade (reverse order)
	];
	
	for (const pattern of gradePatterns) {
		gradeMatch = sectionText.match(pattern);
		if (gradeMatch) {
			grade = gradeMatch[1].trim();
			break;
		}
	}
	console.log('Grade match result:', gradeMatch, 'Final grade:', grade);
	
	// ROBUST PASS EXTRACTION - handles multiple formats  
	let pass = false;
	let passMatch = null;
	
	// Try various pass patterns in order of specificity
	const passPatterns = [
		/-\s*\*\*Pass:\*\*\s*(.*)/i,                    // - **Pass:** true
		/•\s*\*\*Pass:\*\*\s*(.*)/i,                    // • **Pass:** true
		/\*\s*\*\*Pass:\*\*\s*(.*)/i,                 // * **Pass:** true
		/-\s*\*\*Pass\*\*:\s*(.*)/i,                    // - **Pass**: true (colon without space)
		/•\s*\*\*Pass\*\*:\s*(.*)/i,                    // • **Pass**: true (colon without space)
		/\*\s*\*\*Pass\*\*:\s*(.*)/i,                  // * **Pass**: true (colon without space)
		/(?:•|-|\*)\s*\*\*Pass\*\*:?:\s*(.*)/i,             // •/**/- **Pass**: true
		/(?:•|-|\*)\s*Pass:?:\s*(.*)/i,                     // • Pass: true
		/Pass:?:\s*(true|false|✅|❌|TRUE|FALSE)/im,      // Pass: true (anywhere)
		/(true|false|✅|❌|TRUE|FALSE)\s*pass/im         // true pass (reverse)
	];
	
	for (const pattern of passPatterns) {
		passMatch = sectionText.match(pattern);
		if (passMatch) {
			const passValue = passMatch[1].toLowerCase().trim();
			pass = passValue.includes('true') || 
					passValue.includes('✅') || 
					passValue === 'yes' ||
					passValue === 'passed' ||
					passValue === 'pass';
			break;
		}
	}
	console.log('Pass match result:', passMatch, 'Final pass:', pass);

	// ROBUST ERRORS EXTRACTION - handles multiple formats
	let errors: string[] = ['No errors reported.'];
	let errorsMatch = null;
	
	// Try various error patterns
	const errorPatterns = [
		/-\s*\*\*Errors:\*\*\s*([\s\S]*?)(?=\n-\s*\*\*|$)/,             // - **Errors:** []
		/•\s*\*\*Errors:\*\*\s*([\s\S]*?)(?=\n•\s*\*\*|$)/,             // • **Errors:** []
		/\*\s*\*\*Errors:\*\*\s*([\s\S]*?)(?=\n\*\s*\*\*|$)/,         // * **Errors:** []
		/(?:•|-|\*)\s*\*\*Errors?\*\*:?:\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/, // Generic bullet/dash/star + bold
		/(?:•|-|\*)\s*Errors:?:\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/,       // Generic bullet/dash/star + no bold
		/Errors:?:\s*([\s\S]*?)(?=\n(?:•|-|\*|\*\*)|$)/m                   // Errors: anywhere in text
	];
	
	for (const pattern of errorPatterns) {
		errorsMatch = sectionText.match(pattern);
		if (errorsMatch) break;
	}
	
	if (errorsMatch) {
		const errorsBlock = errorsMatch[1].trim();
		
		if (errorsBlock === '[]' || !errorsBlock || errorsBlock.toLowerCase() === 'none') {
			errors = ['No errors reported.'];
		} else if (errorsBlock.startsWith('[') && errorsBlock.includes(']')) {
			// Handle array format: []
			try {
				const parsed = JSON.parse(errorsBlock);
				errors = Array.isArray(parsed) && parsed.length > 0 ? parsed : ['No errors reported.'];
			} catch {
				// If JSON parsing fails, treat as plain text
				errors = [errorsBlock.replace(/[\[\]]/g, '').trim()];
			}
		} else {
			// Handle multi-line bullet format or plain text
			const lines = errorsBlock.split('\n').map(e => e.trim().replace(/^[-•\*]\s*/, '')).filter(Boolean);
			errors = lines.length > 0 ? lines : ['No errors reported.'];
		}
	}

	// ROBUST ANALYSIS/CORRECTED CONTENT EXTRACTION - handles multiple formats
	let corrected = 'Content analysis not available.';
	let contentMatch = null;
	
	// Try various content patterns - Analysis, Corrected, or any descriptive text
	const contentPatterns = [
		/-\s*\*\*Analysis:\*\*\s*([\s\S]*?)(?=\n-\s*\*\*|$)/,            // - **Analysis:** text
		/•\s*\*\*Analysis:\*\*\s*([\s\S]*?)(?=\n•\s*\*\*|$)/,            // • **Analysis:** text
		/\*\s*\*\*Analysis:\*\*\s*([\s\S]*?)(?=\n\*\s*\*\*|$)/,        // * **Analysis:** text
		/-\s*\*\*Corrected:\*\*\s*([\s\S]*?)(?=\n-\s*\*\*|$)/,          // - **Corrected:** text
		/•\s*\*\*Corrected:\*\*\s*([\s\S]*?)(?=\n•\s*\*\*|$)/,          // • **Corrected:** text
		/\*\s*\*\*Corrected:\*\*\s*([\s\S]*?)(?=\n\*\s*\*\*|$)/,      // * **Corrected:** text
		/(?:•|-|\*)\s*\*\*(?:Analysis|Corrected)\*\*:?:\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/, // Generic
		/(?:•|-|\*)\s*(?:Analysis|Corrected):?:\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/, // No bold
		/Analysis:?:\s*([\s\S]*?)(?=\n(?:•|-|\*|\*\*)|$)/m,                  // Analysis: anywhere
		/Corrected:?:\s*([\s\S]*?)(?=\n(?:•|-|\*|\*\*)|$)/m                  // Corrected: anywhere
	];
	
	for (const pattern of contentPatterns) {
		contentMatch = sectionText.match(pattern);
		if (contentMatch) {
			corrected = contentMatch[1].trim();
			break;
		}
	}
	
	// If no Analysis/Corrected found, extract the section title/content as fallback
	if (!contentMatch || corrected.length < 10) {
		// Extract title or first meaningful content line
		const lines = sectionText.split('\n').map(l => l.trim()).filter(Boolean);
		const titleLine = lines.find(line => !line.startsWith('•') && !line.startsWith('-') && !line.startsWith('*') && !line.includes('**') && line.length > 10);
		if (titleLine) {
			corrected = titleLine;
		}
	}
	
	// Clean up any extra formatting
	corrected = corrected.replace(/^#\s*/, '').replace(/###\s*\*\*[^*]+\*\*/, '').trim();
	console.log('Content match result:', contentMatch, 'Final corrected:', corrected.substring(0, 50));
	
	return { grade, pass, errors, corrected };
};


/**
 * Parses the structured QA report format that comes as plain text with sections.
 * @param qaText The raw structured QA text from the API.
 * @returns An object containing the detailed parsed report and top-level pass/grade info.
 */
const parseStructuredQaReport = (qaText: string): { detailedQaReport: DetailedQaReport, overallPass: boolean, overallGrade: string } => {
    const defaultSection: QaSectionResult = { grade: 'N/A', pass: false, errors: ['Parsing failed'], corrected: '' };
    const defaultReport: DetailedQaReport = {
        title: { ...defaultSection },
        meta: { ...defaultSection },
        h1: { ...defaultSection },
        copy: { ...defaultSection },
        overall: { grade: 'N/A', pass: false, primaryIssue: 'Parsing failed' }
    };

    try {
        // Split the text into sections by looking for section headers
        const sections = qaText.split(/(?=^## [A-Z]+)/gm).filter(Boolean);
        
        const parsedData: Partial<DetailedQaReport> = {};
        
        sections.forEach(sectionText => {
            const lines = sectionText.trim().split('\n');
            const header = lines[0]?.replace('## ', '').trim().toLowerCase() || '';
            
            // Extract grade
            const gradeLine = lines.find(line => line.includes('- Grade:'))?.trim() || '';
            const gradeMatch = gradeLine.match(/- Grade:\s*(\d+)\/100/) || gradeLine.match(/- Grade:\s*([^\n]+)/);
            const grade = gradeMatch ? gradeMatch[1].trim() : 'N/A';
            
            // Extract pass status
            const passLine = lines.find(line => line.includes('- Pass:'))?.trim() || '';
            const passMatch = passLine.match(/- Pass:\s*(true|false)/i);
            const pass = passMatch ? passMatch[1].toLowerCase() === 'true' : false;
            
            // Extract errors
            let errors: string[] = [];
            const errorsLineIndex = lines.findIndex(line => line.includes('- Errors:'));
            if (errorsLineIndex !== -1) {
                const errorsContent = lines[errorsLineIndex].replace('- Errors:', '').trim();
                if (errorsContent === '[]' || errorsContent === '') {
                    errors = ['No errors reported.'];
                } else {
                    // Look for multi-line errors
                    let errorText = errorsContent;
                    for (let i = errorsLineIndex + 1; i < lines.length; i++) {
                        if (lines[i].startsWith('- ') && !lines[i].startsWith('  ')) break;
                        errorText += '\n' + lines[i].trim();
                    }
                    
                    // Parse error list
                    if (errorText.startsWith('[') && errorText.includes(']')) {
                        // Handle array format
                        try {
                            const parsedErrors = JSON.parse(errorText);
                            errors = Array.isArray(parsedErrors) ? parsedErrors : [errorText];
                        } catch {
                            errors = [errorText];
                        }
                    } else {
                        // Handle plain text or bullet list
                        errors = errorText.split('\n')
                            .map(e => e.trim().replace(/^- /, ''))
                            .filter(Boolean);
                    }
                    
                    if (errors.length === 0) {
                        errors = ['No errors reported.'];
                    }
                }
            } else {
                errors = ['Errors not found.'];
            }
            
            // Extract corrected content
            let corrected = '';
            const correctedLineIndex = lines.findIndex(line => line.includes('- Corrected:'));
            if (correctedLineIndex !== -1) {
                corrected = lines.slice(correctedLineIndex)
                    .join('\n')
                    .replace('- Corrected:', '')
                    .trim();
            } else {
                corrected = 'Correction not found.';
            }
            
            const sectionResult: QaSectionResult = { grade, pass, errors, corrected };
            
            if (header.includes('title')) {
                parsedData.title = sectionResult;
            } else if (header.includes('meta')) {
                parsedData.meta = sectionResult;
            } else if (header.includes('h1')) {
                parsedData.h1 = sectionResult;
            } else if (header.includes('copy')) {
                parsedData.copy = sectionResult;
            } else if (header.includes('overall')) {
                // Extract primary issue for overall section
                const primaryIssueLine = lines.find(line => line.includes('- Primary Issue:'))?.trim() || '';
                const primaryIssue = primaryIssueLine.replace('- Primary Issue:', '').trim() || 'Not specified.';
                parsedData.overall = { grade, pass, primaryIssue };
            }
        });
        
        const finalReport: DetailedQaReport = {
            title: parsedData.title || { ...defaultSection, errors: ['Title section not found'] },
            meta: parsedData.meta || { ...defaultSection, errors: ['Meta section not found'] },
            h1: parsedData.h1 || { ...defaultSection, errors: ['H1 section not found'] },
            copy: parsedData.copy || { ...defaultSection, errors: ['Copy section not found'] },
            overall: parsedData.overall || { grade: 'N/A', pass: false, primaryIssue: 'Overall section not found' }
        };
        
        return { 
            detailedQaReport: finalReport, 
            overallPass: finalReport.overall.pass, 
            overallGrade: finalReport.overall.grade 
        };
        
    } catch (error) {
        console.error('Error parsing structured QA report:', error);
        return { detailedQaReport: defaultReport, overallPass: false, overallGrade: 'N/A' };
    }
};

/**
 * Parses single-section format where all content is in one block.
 * @param sectionText The section containing all embedded QA data.
 * @param defaultReport Default report structure.
 * @returns Parsed QA report data.
 */
const parseSingleSectionFormat = (sectionText: string, defaultReport: DetailedQaReport): { detailedQaReport: DetailedQaReport, overallPass: boolean, overallGrade: string } => {
    console.log('Parsing single-section format');
    
    // Extract embedded sections by looking for section patterns like "**TITLE:", "**META:", etc.
    const titleMatch = sectionText.match(/\*\*TITLE[^*]*\*\*([\s\S]*?)(?=\*\*[A-Z]+|$)/i);
    const metaMatch = sectionText.match(/\*\*META[^*]*\*\*([\s\S]*?)(?=\*\*[A-Z]+|$)/i);
    const h1Match = sectionText.match(/\*\*H1[^*]*\*\*([\s\S]*?)(?=\*\*[A-Z]+|$)/i);
    const copyMatch = sectionText.match(/\*\*COPY[^*]*\*\*([\s\S]*?)(?=\*\*[A-Z]+|$)/i);
    const overallMatch = sectionText.match(/\*\*(?:OVERALL|ASSESSMENT)[^*]*\*\*([\s\S]*?)$/i);
    
    const finalReport: DetailedQaReport = {
        title: titleMatch ? parseSection(titleMatch[1]) : { ...defaultReport.title, errors: ['Title section not found'] },
        meta: metaMatch ? parseSection(metaMatch[1]) : { ...defaultReport.meta, errors: ['Meta section not found'] },
        h1: h1Match ? parseSection(h1Match[1]) : { ...defaultReport.h1, errors: ['H1 section not found'] },
        copy: copyMatch ? parseSection(copyMatch[1]) : { ...defaultReport.copy, errors: ['Copy section not found'] },
        overall: overallMatch ? { 
            grade: extractOverallGrade(overallMatch[1]),
            pass: extractOverallPass(overallMatch[1]),
            primaryIssue: 'Single-section format parsed'
        } : { ...defaultReport.overall }
    };
    
    return { 
        detailedQaReport: finalReport, 
        overallPass: finalReport.overall.pass, 
        overallGrade: finalReport.overall.grade 
    };
};

/**
 * Helper function to extract overall grade from text.
 */
const extractOverallGrade = (text: string): string => {
    const gradeMatch = text.match(/Grade[^:]*:?\s*(\d+(?:\.\d+)?\/?\d*)/i) || text.match(/(\d+(?:\.\d+)?\/\d+)/);
    return gradeMatch ? gradeMatch[1].trim() : 'N/A';
};

/**
 * Helper function to extract overall pass from text.
 */
const extractOverallPass = (text: string): boolean => {
    const passMatch = text.match(/Pass[^:]*:?\s*(true|false|✅|❌|TRUE|FALSE)/i);
    if (passMatch) {
        const passValue = passMatch[1].toLowerCase().trim();
        return passValue.includes('true') || passValue.includes('✅');
    }
    return false;
};

/**
 * Enhanced section parsing that captures ALL QA Guard content
 */
const parseEnhancedSection = (sectionBlock: string): QaSectionResult => {
	const baseSection = parseSection(sectionBlock);
	
	// Extract detailed assessment content
	const detailedAssessmentMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*(?:Detailed\s+)?Assessment\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/i);
	const explanationsMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*(?:Explanation|Reasoning)\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/i);
	
	// Extract key strengths
	const keyStrengthsMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*Key\s+Strengths\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/i);
	const strengthsList = keyStrengthsMatch ? 
		keyStrengthsMatch[1].split('\n')
			.map(line => line.replace(/^[-•*]\s*/, '').trim())
			.filter(line => line.length > 0) : undefined;
	
	// Extract recommendations
	const recommendationsMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*(?:Recommendations?|Suggestions?)\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/i);
	const recommendationsList = recommendationsMatch ? 
		recommendationsMatch[1].split('\n')
			.map(line => line.replace(/^[-•*]\s*/, '').trim())
			.filter(line => line.length > 0) : undefined;
	
	return {
		...baseSection,
		detailedAssessment: detailedAssessmentMatch ? detailedAssessmentMatch[1].trim() : undefined,
		explanations: explanationsMatch ? explanationsMatch[1].trim() : undefined,
		keyStrengths: strengthsList,
		recommendations: recommendationsList,
		rawContent: sectionBlock
	};
};

/**
 * Enhanced overall section parsing that captures ALL QA Guard content
 */
const parseEnhancedOverallSection = (sectionBlock: string): { grade: string; pass: boolean; primaryIssue: string; detailedAssessment?: string; keyStrengths?: string[]; recommendations?: string[]; explanations?: string; rawContent?: string } => {
	// ROBUST OVERALL GRADE EXTRACTION - handles multiple formats
	let grade = 'N/A';
	let gradeMatch = null;
	
	const overallGradePatterns = [
		/-\s*\*\*Final Grade:\*\*\s*(.*)/,                       // - **Final Grade:** 100/100
		/•\s*\*\*Final Grade:\*\*\s*(.*)/,                       // • **Final Grade:** 100/100
		/\*\s*\*\*Final Grade:\*\*\s*(.*)/,                    // * **Final Grade:** 100/100
		/-\s*\*\*Total Grade:\*\*\s*(.*)/,                       // - **Total Grade:** 100/100
		/•\s*\*\*Total Grade:\*\*\s*(.*)/,                       // • **Total Grade:** 100/100
		/\*\s*\*\*Total Grade:\*\*\s*(.*)/,                    // * **Total Grade:** 100/100
		/(?:•|-|\*)\s*\*\*(?:Final|Total|Overall)?\s*Grade\*\*:?:\s*(.*)/i, // Generic grade
		/(?:•|-|\*)\s*(?:Final|Total|Overall)?\s*Grade:?:\s*(.*)/i,  // No bold
		/(?:Final|Total|Overall)\s*Grade:?:\s*(\d+\/\d+|\d+)/im,   // Anywhere in text
		/(\d+\/\d+)\s*(?:final|total|overall)?/im                // Number first
	];
	
	for (const pattern of overallGradePatterns) {
		gradeMatch = sectionBlock.match(pattern);
		if (gradeMatch) {
			grade = gradeMatch[1].trim();
			break;
		}
	}
	console.log('Overall grade match:', gradeMatch, 'Final grade:', grade);
	
	// ROBUST OVERALL PASS EXTRACTION - handles multiple formats  
	let pass = false;
	let passMatch = null;
	
	const overallPassPatterns = [
		// Exact format variations found in logs
		/-\s*\*\*Overall Pass:\*\*\s*(.*)/i,                     // - **Overall Pass:** true
		/•\s*\*\*Overall Pass:\*\*\s*(.*)/i,                     // • **Overall Pass:** true
		/\*\s*\*\*Overall Pass:\*\*\s*(.*)/i,                    // * **Overall Pass:** true
		/•\s*\*\*All Sections Pass:\*\*\s*(.*)/i,                // • **All Sections Pass:** true
		/-\s*\*\*All Sections Pass:\*\*\s*(.*)/i,                // - **All Sections Pass:** true
		/\*\s*\*\*All Sections Pass:\*\*\s*(.*)/i,               // * **All Sections Pass:** true
		/•\s*\*\*Final Pass:\*\*\s*(.*)/i,                        // • **Final Pass:** true
		/-\s*\*\*Final Pass:\*\*\s*(.*)/i,                        // - **Final Pass:** true
		/\*\s*\*\*Final Pass:\*\*\s*(.*)/i,                       // * **Final Pass:** true
		
		// Generic patterns with flexible formatting
		/(?:•|-|\*)\s*\*\*(?:Overall\s+|All\s+Sections\s+|Final\s+)?Pass\*\*:?:\s*(.*)/i,
		/(?:•|-|\*)\s*(?:Overall\s+|All\s+Sections\s+|Final\s+)?Pass:?:\s*(.*)/i,
		
		// Anywhere in text patterns
		/Pass:?:\s*(true|false|✅|❌|TRUE|FALSE)/im,
		/Overall\s*Pass:?:\s*(true|false|✅|❌|TRUE|FALSE)/im,
		/All\s*Sections\s*Pass:?:\s*(true|false|✅|❌|TRUE|FALSE)/im,
		/(true|false|✅|❌|TRUE|FALSE)\s*(?:overall|pass)/im,
		
		// Handle capitalized boolean values
		/Pass:?:\s*(True|False|TRUE|FALSE)/im,
		/Overall\s*Pass:?:\s*(True|False|TRUE|FALSE)/im
	];
	
	for (const pattern of overallPassPatterns) {
		passMatch = sectionBlock.match(pattern);
		if (passMatch) {
			const passValue = passMatch[1].toLowerCase().trim();
			pass = passValue.includes('true') || 
					passValue.includes('✅') || 
					passValue === 'yes' ||
					passValue === 'passed' ||
					passValue === 'pass';
			break;
		}
	}
	console.log('Overall pass match:', passMatch, 'Final pass:', pass);
	
	// Look for various primary issue formats
	const explanationMatch = sectionBlock.match(/\*\*Overall Pass\*\*:\s*[^()]*\(([^)]+)\)/);
	const statusMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*(?:Pipeline\s+)?Status\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/);
	const primaryIssueMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*(?:Primary\s+)?Issue\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/) ||
							sectionBlock.match(/(?:•|-|\*)\s*(?:Primary\s+)?Issue:?:\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/);
	const errorsMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*Total\s+Errors?\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/);
	const totalSectionsMatch = sectionBlock.match(/Total\s*Sections\s*Passing:?:\s*([^\n]+)/i);
	
	let primaryIssue = 'All sections passed successfully.';
	if (explanationMatch) {
		primaryIssue = explanationMatch[1].trim();
	} else if (statusMatch) {
		primaryIssue = statusMatch[1].trim();
	} else if (primaryIssueMatch) {
		primaryIssue = primaryIssueMatch[1].trim();
	} else if (errorsMatch) {
		const errorText = errorsMatch[1].trim();
		if (errorText !== '[]' && errorText !== '') {
			primaryIssue = `Errors found: ${errorText}`;
		}
	}
	if (totalSectionsMatch) {
		primaryIssue = `${primaryIssue} | Total Sections Passing: ${totalSectionsMatch[1].trim()}`;
	}
	
	console.log('Primary issue extraction - explanation:', explanationMatch, 'status:', statusMatch, 'issue:', primaryIssueMatch, 'Final issue:', primaryIssue);
	
	// Extract detailed assessment content
	const detailedAssessmentMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*(?:Detailed\s+)?Assessment\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/i);
	const explanationsMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*(?:Explanation|Reasoning)\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/i);
	
	// Extract key strengths
	const keyStrengthsMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*Key\s+Strengths\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/i);
	const strengthsList = keyStrengthsMatch ? 
		keyStrengthsMatch[1].split('\n')
			.map(line => line.replace(/^[-•*]\s*/, '').trim())
			.filter(line => line.length > 0) : undefined;
	
	// Extract recommendations
	const recommendationsMatch = sectionBlock.match(/(?:•|-|\*)\s*\*\*(?:Recommendations?|Suggestions?)\*\*?:?\s*([\s\S]*?)(?=\n(?:•|-|\*)\s*\*\*|$)/i);
	const recommendationsList = recommendationsMatch ? 
		recommendationsMatch[1].split('\n')
			.map(line => line.replace(/^[-•*]\s*/, '').trim())
			.filter(line => line.length > 0) : undefined;
	
	console.log('Setting overall data - grade:', grade, 'pass:', pass, 'primaryIssue:', primaryIssue);
	
	return { 
		grade, 
		pass, 
		primaryIssue,
		detailedAssessment: detailedAssessmentMatch ? detailedAssessmentMatch[1].trim() : undefined,
		explanations: explanationsMatch ? explanationsMatch[1].trim() : undefined,
		keyStrengths: strengthsList,
		recommendations: recommendationsList,
		rawContent: sectionBlock
	};
};

/**
 * Determine the type of an additional section based on its content
 */
const determineSectionType = (sectionBlock: string): 'assessment' | 'strengths' | 'recommendations' | 'explanations' | 'other' => {
	const lowerContent = sectionBlock.toLowerCase();
	
	if (lowerContent.includes('strength') || lowerContent.includes('positive') || lowerContent.includes('excellent')) {
		return 'strengths';
	} else if (lowerContent.includes('recommend') || lowerContent.includes('suggest') || lowerContent.includes('improve')) {
		return 'recommendations';
	} else if (lowerContent.includes('explain') || lowerContent.includes('reason') || lowerContent.includes('why')) {
		return 'explanations';
	} else if (lowerContent.includes('assess') || lowerContent.includes('evaluate') || lowerContent.includes('analysis')) {
		return 'assessment';
	} else {
		return 'other';
	}
};

/**
 * Parses the new, structured QA report format.
 * @param qaText The raw `qa_gaurd` string from the API.
 * @returns An object containing the detailed parsed report and top-level pass/grade info.
 */
const parseNewQaReport = (qaText: string): { detailedQaReport: DetailedQaReport, overallPass: boolean, overallGrade: string } => {
	// Default structure in case of parsing failure
	const defaultSection: QaSectionResult = { grade: 'N/A', pass: false, errors: ['Parsing failed'], corrected: '' };
	const defaultReport: DetailedQaReport = {
		title: { ...defaultSection },
		meta: { ...defaultSection },
		h1: { ...defaultSection },
		copy: { ...defaultSection },
		overall: { grade: 'N/A', pass: false, primaryIssue: 'Parsing failed' },
		completeRawReport: qaText // Always preserve the complete raw report
	};

	const cleanedQaText = cleanResponseText(qaText);
	if (!cleanedQaText || typeof cleanedQaText !== 'string') {
		return { detailedQaReport: defaultReport, overallPass: false, overallGrade: 'N/A' };
	}
	
	// Check if it's the new markdown format (starts with ##) or contains **TITLE** style sections
	if (cleanedQaText.startsWith('##') || cleanedQaText.includes('**TITLE**') || cleanedQaText.includes('### **') || cleanedQaText.includes('### TITLE')) {
		console.log('Using enhanced markdown parser for QA report');
		console.log('QA text starts with:', cleanedQaText.substring(0, 200));
		
		// Handle different section header formats
		let sections;
		if (cleanedQaText.includes('### **')) {
			// Split on ### ** and keep the ** in the section content
			sections = cleanedQaText.split(/(?=### \*\*)/g).slice(1);
			console.log('Splitting on ### ** (keeping section headers)');
		} else if (cleanedQaText.includes('**TITLE**')) {
			// Split on bold section headers like **TITLE**, **META**, etc.
			sections = cleanedQaText.split(/(?=\*\*(?:TITLE|META|H1|COPY|OVERALL|ASSESSMENT|CORRECTED COPY)[^*]*\*\*)/g).slice(1);
			console.log('Splitting on **SECTION** headers');
		} else if (cleanedQaText.includes('### ')) {
			// Split generic ### headers
			sections = cleanedQaText.split(/(?=###\s+)/g).slice(1);
			console.log('Splitting on generic ### headers');
		} else {
			sections = cleanedQaText.split('## ').slice(1);
			console.log('Splitting on ## headers');
		}
		console.log('Found sections:', sections.length);
		sections.forEach((section, index) => {
			console.log(`Section ${index}:`, section.substring(0, 100));
		});
		
		const parsedData: Partial<DetailedQaReport> = {};
		let correctedCopyFromSeparateSection = '';
		const additionalSections: { [sectionName: string]: { content: string; type: 'assessment' | 'strengths' | 'recommendations' | 'explanations' | 'other'; } } = {};
		
		// Special handling for single-section format like "## GRADE REPORT"
		if (sections.length === 1 && (sections[0].includes('GRADE REPORT') || sections[0].includes('QUALITY ASSURANCE'))) {
			console.log('Detected single-section format, parsing embedded sections');
			return parseSingleSectionFormat(sections[0], defaultReport);
		}
		
		sections.forEach(sectionBlock => {
			const lines = sectionBlock.trim().split('\n');
			let headerRaw = lines[0].trim();
			let header = headerRaw.toLowerCase();
			
			// Clean up header - remove markdown formatting and punctuation
			header = header.replace(/^#+\s*/, '').replace(/\*\*/g, '').replace(/[:\-–]+$/, '').trim();
			console.log('Processing header:', header);

			// Enhanced section parsing to capture ALL content
			if (header.includes('title')) {
				console.log('Parsing title section with enhanced content capture');
				parsedData.title = parseEnhancedSection(sectionBlock);
			} else if (header.includes('meta')) {
				console.log('Parsing meta section with enhanced content capture');
				parsedData.meta = parseEnhancedSection(sectionBlock);
			} else if (header.includes('h1')) {
				console.log('Parsing h1 section with enhanced content capture');
				parsedData.h1 = parseEnhancedSection(sectionBlock);
			} else if (header.includes('copy') && !header.includes('corrected')) {
				console.log('Parsing copy section with enhanced content capture');
				parsedData.copy = parseEnhancedSection(sectionBlock);
			} else if (header.includes('corrected') && header.includes('copy')) {
				console.log('Capturing separate CORRECTED COPY section');
				correctedCopyFromSeparateSection = lines.slice(1).join('\n').trim();
			} else if (header.includes('overall') || header.includes('assessment') || header.includes('pipeline')) {
				console.log('Parsing overall section with enhanced content capture');
				console.log('Overall section text:', sectionBlock.substring(0, 300));
				
				// Enhanced overall section parsing to capture ALL content
				const enhancedOverall = parseEnhancedOverallSection(sectionBlock);
				parsedData.overall = enhancedOverall;
			} else {
				// Capture any additional sections that don't match standard patterns
				console.log('Capturing additional section:', header);
				const sectionType = determineSectionType(sectionBlock);
				additionalSections[header] = {
					content: sectionBlock,
					type: sectionType
				};
			}
		});

		const finalReport: DetailedQaReport = {
			title: parsedData.title || { ...defaultSection, errors: ['Title section not found'] },
			meta: parsedData.meta || { ...defaultSection, errors: ['Meta section not found'] },
			h1: parsedData.h1 || { ...defaultSection, errors: ['H1 section not found'] },
			copy: parsedData.copy || { ...defaultSection, errors: ['Copy section not found'] },
			overall: parsedData.overall || { grade: 'N/A', pass: false, primaryIssue: 'Overall section not found' },
			additionalSections: Object.keys(additionalSections).length > 0 ? additionalSections : undefined,
			completeRawReport: qaText
		};

		// If we saw a separate CORRECTED COPY section, populate copy.corrected with it when useful
		if (correctedCopyFromSeparateSection) {
			const cleanedCorrected = correctedCopyFromSeparateSection.replace(/^###.*$/m, '').trim();
			if (!finalReport.copy.corrected || finalReport.copy.corrected.length < 20) {
				finalReport.copy.corrected = cleanedCorrected;
			}
		}

		// If no explicit overall section was found, check for inline overall results at end of text
		if (!parsedData.overall) {
			// Look for overall results anywhere in the full text (sometimes appears at the end)
			const inlineOverallGradeMatch = cleanedQaText.match(/##?\s*OVERALL\s*(?:PIPELINE\s*)?GRADE:?:\s*([^#\n]+)/i);
			const inlineOverallPassMatch = cleanedQaText.match(/##?\s*OVERALL\s*(?:PIPELINE\s*)?PASS:?:\s*([^#\n(]+)/i);
			
			if (inlineOverallGradeMatch || inlineOverallPassMatch) {
				let grade = 'N/A';
				let pass = false;
				
				if (inlineOverallGradeMatch) {
					grade = inlineOverallGradeMatch[1].trim();
				}
				
				if (inlineOverallPassMatch) {
					const passValue = inlineOverallPassMatch[1].toLowerCase().trim();
					pass = passValue.includes('true') || 
							passValue.includes('✅') || 
							passValue === 'yes' ||
							passValue === 'passed';
				}
				
				parsedData.overall = {
					grade,
					pass,
					primaryIssue: pass ? 'All sections passed successfully.' : 'Overall assessment failed.',
					rawContent: cleanedQaText
				};
				
				console.log('Found inline overall results - grade:', grade, 'pass:', pass);
			} else {
				// Calculate overall pass from individual sections
				const allSectionsPassed = finalReport.title.pass && 
											finalReport.meta.pass && 
											finalReport.h1.pass && 
											finalReport.copy.pass;
				
				// Calculate average grade if all sections have numeric grades
				let averageGrade = 'N/A';
				const grades = [finalReport.title.grade, finalReport.meta.grade, finalReport.h1.grade, finalReport.copy.grade];
				const numericGrades = grades.filter(g => g !== 'N/A' && g !== undefined)
										   .map(g => {
										   const match = String(g).match(/(\d+(?:\.\d+)?)/);
										   return match ? parseFloat(match[1]) : null;
									   })
									   .filter(g => g !== null) as number[];
				
				if (numericGrades.length === 4) {
					const avg = numericGrades.reduce((sum, grade) => sum + grade, 0) / numericGrades.length;
					averageGrade = `${avg.toFixed(2)}/100`;
				}
				
				parsedData.overall = {
					grade: averageGrade,
					pass: allSectionsPassed,
					primaryIssue: allSectionsPassed ? 'All sections passed successfully.' : 'One or more sections failed.',
					rawContent: cleanedQaText
				};
				
				console.log('Calculated overall from individual sections - pass:', allSectionsPassed, 'grade:', averageGrade);
			}
			
			// Update the final report with the calculated/found overall data
			finalReport.overall = parsedData.overall;
		}
		
		console.log('Final parsed QA data:', finalReport.overall);
		console.log('Setting overallPass:', finalReport.overall.pass, 'overallGrade:', finalReport.overall.grade);
		console.log('Additional sections captured:', Object.keys(additionalSections));
		
		return { 
			detailedQaReport: finalReport, 
			overallPass: finalReport.overall.pass, 
			overallGrade: finalReport.overall.grade 
		};
	} else {
		// Parse the new structured format
		return parseStructuredQaReport(cleanedQaText);
	}
};


/**
 * Runs the Dify workflow for a given input row, with retries for transient errors.
 * @param inputs - The data from a CSV row.
 * @returns A promise that resolves to the processed and cleaned results.
 */
export const runWorkflow = async (inputs: ApiInput): Promise<ProcessedResult> => {
    let lastError: Error = new Error('Workflow failed after all retries.');

    for (let attempt = 1; attempt <= MAX_RETRIES; attempt++) {
        let responseText = '';
        try {
            const payload = {
                inputs,
                response_mode: 'streaming',
                user: API_USER,
            };

            const response = await fetch(API_URL, {
                method: 'POST',
                headers: {
                    'Authorization': `Bearer ${API_TOKEN}`,
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify(payload),
            });

            if (!response.ok) {
                responseText = await response.text();
                // Check for retryable HTTP status codes.
                if (RETRYABLE_STATUS_CODES.includes(response.status)) {
                    throw new WorkflowError(`RETRYABLE_HTTP_${response.status}`, `Temporary service issue (HTTP ${response.status}).`, 'network', responseText);
                }
                // For other HTTP errors, fail immediately.
                throw new WorkflowError(`HTTP_${response.status}`, `API request failed (HTTP ${response.status}).`, 'api', responseText);
            }

            if (!response.body) {
                throw new WorkflowError('EMPTY_RESPONSE', 'Empty response from API.', 'network');
            }

            const reader = response.body.getReader();
            const decoder = new TextDecoder();
            let streamContent = '';
            while (true) {
                const { done, value } = await reader.read();
                if (done) break;
                streamContent += decoder.decode(value, { stream: true });
            }

            // The full stream content becomes our responseText for error logging
            responseText = streamContent;

            const lines = streamContent.trim().split('\n');
            const finishedLine = lines.find(line => line.includes('"event": "workflow_finished"')) || '';

            if (!finishedLine) {
                // The gateway might have returned an HTML error page instead of a stream
                if (streamContent.trim().toLowerCase().startsWith('<html')) {
                    throw new WorkflowError('RETRYABLE_HTML_RESPONSE', 'Service returned an HTML error page.', 'stream', streamContent.slice(0, 1000));
                }
                console.error('Full stream content:', streamContent);
                throw new WorkflowError('FINISH_EVENT_MISSING', 'Workflow did not finish successfully.', 'stream', streamContent.slice(0, 1000));
            }

            const jsonString = finishedLine.replace(/^data: /, '');
            const finishedEventData = JSON.parse(jsonString);
            
            if (finishedEventData.data.status !== 'succeeded') {
                const apiError = finishedEventData.data.error || 'Unknown';
                const isOverloaded = typeof apiError === 'string' && (apiError.toLowerCase().includes('overloaded') || apiError.toLowerCase().includes('gateway time-out'));
                
                // If it's a known transient error, mark it as retryable.
                if (isOverloaded) {
                    throw new WorkflowError('RETRYABLE_API_ERROR', 'Service overloaded. Retrying...', 'api', String(apiError));
                }
                // Otherwise, it's a permanent failure for this row.
                throw new WorkflowError('WORKFLOW_FAILED', `Workflow failed: ${apiError}`, 'api', String(apiError));
            }

            const outputs: ApiResponseOutput = finishedEventData.data.outputs;

            if (!outputs || Object.keys(outputs).length === 0) {
                throw new WorkflowError('EMPTY_OUTPUTS', 'Workflow succeeded but returned empty outputs.', 'parse');
            }
            
            const rawQaReport = outputs.qa_gaurd || 'QA report not available.';
            console.log('QA Report length:', rawQaReport.length);
            
            const { detailedQaReport, overallPass, overallGrade } = parseNewQaReport(rawQaReport);
            console.log('Final Parsed QA - Pass:', overallPass, 'Grade:', overallGrade);

            // Success, return the result and exit the loop.
            return {
                generatedTitle: cleanResponseText(outputs.title),
                generatedH1: cleanResponseText(outputs.h1),
                generatedCopy: cleanResponseText(outputs.copy),
                generatedMeta: cleanResponseText(outputs.meta),
                qaReport: rawQaReport,
                detailedQaReport,
                overallPass,
                overallGrade,
            };

        } catch (error) {
            lastError = error instanceof Error ? error : new Error(String(error));

            const isRetryable = lastError instanceof WorkflowError && lastError.code.startsWith('RETRYABLE_');
            
            if (isRetryable && attempt < MAX_RETRIES) {
                // Exponential backoff with jitter: 1s, 2s, 4s, ... + random
                const delayMs = INITIAL_RETRY_DELAY_MS * Math.pow(2, attempt - 1);
                console.warn(`Attempt ${attempt}/${MAX_RETRIES} failed due to a transient error. Retrying in ~${Math.round(delayMs / 1000)}s...`, { error: lastError.message });
                await delay(delayMs);
                continue; // Move to the next attempt
            }
            
            // For non-retryable errors, or if we've exhausted retries, break the loop to throw the error.
            console.error(`Failed to process row. Attempt ${attempt}/${MAX_RETRIES}. Error: ${lastError.message}`);
            if (responseText) {
                // Log the problematic response that caused the failure
                console.error('Problematic Response:', responseText);
            }
            break;
        }
    }

    // If the loop finished without returning, it means all attempts failed.
    // We re-throw the last captured error, making it more user-friendly if it was a transient one.
    if (lastError instanceof WorkflowError && lastError.code.startsWith('RETRYABLE_')) {
        throw new WorkflowError('SERVICE_UNAVAILABLE', `API service is temporarily unavailable. Tried ${MAX_RETRIES} times. Please try again later.`, 'api', lastError.debug || lastError.stack);
    }
    
    throw lastError;
};